Abstract: We talk about phase transitions that occur only outside the linear-response regime of current-driven non-equilibrium states by studying nonlinear quark-charge conductivity by using the AdS/CFT correspondence. We consider the strongly-interacting (3 + 1)-dimensional N = 4 large-Nc SU(Nc) supersymmetric Yang-Mills theory with a single flavor of fundamental N = 2 hypermultiplet as a microscopic theory(D3/D7). We compute its .At the end I will talk about magnetic field effect on these phases and generalization to Dp/Dq systems.